GHK Cu Focal Point Vitality Hair Growth Serum Intense with Copper Peptide GHK Cu Mayraki When your hair feels stronger, you do too. The Hairgenetix Extra Strength Copper Peptide Serum, formulated with 10% GHK Cu and 5% AHK Cu, supports hair health at the root helping strengthen follicles, Two Ingredients. Real Hair Transformations. How Neurogan Health's GHK Cu Serum Is Changing What Customers Expect From Hair Care